id:A108361 - OEIS Search Results

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Diagonal sums of number triangle A108359.

+0
2

1, 1, 2, 4, 7, 13, 25, 47, 90, 172, 329, 629, 1202, 2294, 4374, 8330, 15847, 30115, 57172, 108434, 205473, 389019, 735927, 1391121, 2627720, 4960134, 9356707, 17639323, 33234036, 62580444, 117776828, 221542596, 416524573, 782743029 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n)=sum{k=0..floor(n/2), sum{j=0..n-2k, C(k, j)C(n-k-j, k)*floor((j+2)/2)}}.`
	CROSSREFS	`Sequence in context: A079958 A018082 A018083 this_sequence A082423 A119266 A102026` `Adjacent sequences: A108358 A108359 A108360 this_sequence A108362 A108363 A108364`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), May 31 2005`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

AT&T Labs Research